WO2003000109A2

WO2003000109A2 - Respirator mask

Info

Publication number: WO2003000109A2
Application number: PCT/US2002/012597
Authority: WO
Inventors: Jussi Severi Uusitalo; Jyrki Hannu Veli Jarvinen; Juha Antero Kinnunen; Ville-Petteri Nenonen
Original assignee: Scott Technologies, Inc.
Priority date: 2001-04-23
Filing date: 2002-04-23
Publication date: 2003-01-03
Also published as: WO2003000109A9; CA2445797A1; NO335794B1; US20040182385A1; EP1385414A4; WO2003000109A3; US7051732B2; EP1385414A2; NO20034620L; AU2002335616B2; NO20034620D0; JP2005502395A; CA2445797C; KR20040005931A

Abstract

The present invention is directed to a respiratory helmet (10). The helmet is designed to provide protection to a user's cranium area. The helmet also has a visor (11) designed to provide protection to the user's face area, an air intake system, and a parallel elliptical rail system (13). The visor can be positioned on the helmet, in front of the user's face area, and any position in between. The area between the visor, when the visor is positioned in front of the user's face area and the face area is called the breathing zone. The visor has at least two wheels (88), a top side and a bottom side wherein the bottom side is positioned closer to the user's chin when the visor is positioned in front of the user's face. The air intake system has an intake unit that receives a gaseous medium from a gaseous medium supply system or the ambient air into the helmet, and the intake unit directs the gaseous medium toward the breathing zone. The parallel elliptical rail system allows the visor to move in an elliptical motion. Each rail receives at least one wheel of the visor, and is designed to decrease the accumulation of particulates on the rail.

Description

RESPIRATOR HELMET

Claim of Priority

This application claims priority to U.S. provisional application no. 60/285,876 that was filed on April 23, 2001. Field of the Invention

The present invention is directed to a respirator helmet with a movable visor. Background of the Invention

There are numerous types of respirator helmets. Many respirator helmets have an interior space between the head and the interior surface of the respirator helmet. Within that space, the respirator helmet is designed to forward a sufficient amount of air toward the nose and mouth of the user of the respirator helmet. The air is forwarded toward the user's breathing orifices by either a built-in air filter and fan, or by a remote air supply system that feeds the air into the helmet interior through a suitable tube or pipe. Containing the air about the user's orifices is accomplished through a suitable design of a full-face visor, normally transparent. Examples of these respiratory helmets are disclosed in U.S. Patent numbers 4,590,951, 4,097,929 and 4,136,688, all of which are commonly assigned to Racal Limited or subsidiaries thereof. The invention disclosed in the '929 patent is a protective visor. The visor

"comprises an arcuately curved frame having an aperture arranged to accept an arcuately flexed rectangular sheet of resilient transparent material. The sheet is retained in the frame by lugs extending into the aperture at staggered positions on the inner and outer margins of the upper and lower frame bars and has at the sides of the aperture recesses in the frame side bars into which the lateral edges of the transparent sheet will snap. The sheet may be of transparent polycarbonate [material] and the frame of either transparent or opaque polycarbonate. Preferably the frame has at its upper corners hinge members for attachment to a protective helmet." The helmet disclosed in the '929 patent, however, was apparently not sufficiently dust proof because Racal filed another application that matured into the '688 patent that addressed that problem. In particular, Racal suggested using bristles within the helmet to solve this problem. In each helmet illustrated in the '929 and '688 patents, there is a hard helmet having an exterior and interior surface, a visor that rotates about a single point immediately above the user's ears, an air space between a user's head and the interior surface, and an aperture on the rear of the helmet to receive an air tube. This air space is where the air from the air tube traverses through the helmet. The air is pushed through this air space by a fan, which is positioned near the aperture, within the interior surface, and spaced away from the user's head by a second interior wall. The air enters the interior of the helmet, and is pushed into the area between the visor and the user's mouth. After a number of years, Racal filed another application that matured into the

'951 patent. The '951 patent illustrates a different embodiment of a respiratory helmet. Instead of the air hose entering the helmet at or near the anterior neck, the air tube enters the helmet near the user's mouth. As such, Racal was working on alternative embodiments of a respirator helmet to correct the problems of the previous models, some which are mobility of the head and dirt permeating through the shield due to a poor pivot point. Summary of the Invention

The present invention is directed to a respiratory helmet. The helmet is designed to provide protection to a user's cranium area. The helmet also has a visor designed to provide protection to the user's face area, an air intake system, and a parallel elliptical rail system. The visor can be positioned on the helmet, in front of the user's face area, and any position in between. The area between the visor, when the visor is positioned in front of the user's face area and the face area is called the breathing zone. The visor has at least two wheels, a top side and a bottom side wherein the bottom side is positioned closer to the user's chin when the visor is positioned in front of the user's face. The air intake system has an intake unit that receives a gaseous medium from a gaseous medium supply system or the ambient air into the helmet, and the intake unit directs the gaseous medium toward the breathing zone. The parallel elliptical rail system allows the visor to move in an elliptical motion. Each rail receives at least one wheel of the visor, and is designed to decrease the accumulation of particulates on the rail. Brief Description of the Figures

Figure 1 is an exploded view of the present invention. Figures 2a, b, c, d, e, and f illustrate various embodiments of the present invention.

Figures 3a-c illustrate different embodiments of the wheel in the rail system.

Figures 4a-b illustrate different wheel embodiments. Figure 5 illustrates an electrical schematic of the LED wire system.

Figure 6 illustrates an alternative embodiment of the present invention.

Figures 7a-f illustrate alternative embodiments of the present invention.

Figure 8 illustrates a chin frame. Detailed Description of the Invention Figure 1 shows an exploded view of respirator helmet 10 including a first visor assembly 11, a second visor assembly 110. The first visor assembly 11 includes a frame member 12 which is attached by way of wheels, preferably made of elastomeric plastic material and will be identified as item 88, to parallel elliptical rails 13 on the exterior surface 89 of the helmet 10. Each rail 13 has a profile designed to (1) avoid the accumulation of dirt on the rails and on the wheels, (2) make the wheels have a narrow contact on the rails 13.

Turning to Figures 3a, 3b, and 3c, these figures illustrate cross-sectional views of a wheel 88 within a portion of the rail 13. The rail 13 is a part of the exterior surface of the helmet 10. The rail 13 has a recess area 90 that intrudes into the helmet 10. The recess area 90 has a width W and height H which are respectively greater than, or in at least one embodiment equal to, the width D and height I of the wheel 88 which allows the wheels 88 to rotate within the rail 13. In addition the recess area 90 has a contact surface 91 that has a width J that is greater than the width K of the contacting portion 92 of the wheel 88 to allow the wheel 88 to rotate within the rail 13.

In some instances, the widths W and D, and J and K, and the heights H and I, can be the same to provide zero clearance. Such zero clearance is used when the wheels 88 are made of material, like elastomeric polymers, that (1) minimizes rattling when the visors 11, 110 are moved in relation to the helmet 10, and (2) allows the wheels 88 to overcome an occasional obstacle when the wheels rotate within the rails 13.

When the wheels 88 have the preferred or the non-preferred material, the wheels can overcome the occasional obstacle by the shape of the wheel's contacting surface 92. As shown in Figures 4a and 4b, the contacting surface 92 can be tapered into a single point as illustrated in Figure 4a, or have at least one groove 97 which allows a plurality of point contacting surfaces as shown in Figure 4b. In any case, the wheels are designed to overcome any and all obstacles that are on the rail 13. Obstacles in the rail, however, are undesired. Hence, the inventors have designed rail profiles to prevent the build up of such obstacles. In one embodiment, the rail 13 has a lip 92 that extends over a predetermined portion of the recessed area 90, preferably the upper portion 93 of the recessed area 90. This lip 92 can be a straight surface in relation to the exterior surface 89, as shown in Figures 3 a and 3b, or a flared surface in relation to the exterior surface 89, as shown in Figure 3b. In any case, the lip 92 is designed to direct dirt and other undesired particles from accumulating in the rail 13.

The rail profile also has various designs for the bottom surface 95 of the recess area 90. The bottom surface 95 must have the contact surface 91 which is designed to allow the wheel 88 to rotate within the rail. Therefore, the contact surface 91 is preferably perpendicular, or close to being perpendicular, relative to the exterior surface 89, and also elliptical about the helmet. The remaining portion 96 that can be straight, as shown in Figure 3a, or tapered away from the lip 92 as shown in Figures 3b and 3 c. These designs are designed to direct dirt and other undesired particles from accumulating in the rail 13. The wheels are in the rails because it allows the first and, the optional second, visors 11, 110 to rotate about the helmet without using a pivot point, which is used in the prior art. Without the pivot point, the helmet is better balanced resulting in increased user comfort. Additionally, the movement of the visors 11, 110 does not deviate as much from the helmet's natural center of gravity in relation to a pivot point visor, and the helmet can expose the user's ears for independent ear protection gear, independent hearing receivers and incorporated hearing receivers 30, which are illustrated in Figure 2F.

Each wheel 88 rotates about an axis 60 that is securely attached to the frame member 12. The frame member 12 is made of a material that conforms to the desired industrial standards. In addition, the first visor 11 is securely attached to the frame member 12 in such a manner that it meets or exceeds the desired industrial standards for impact resistance, temperature resistance and the like.

The visor 12 material, like the attachment apparatus, has to meet or exceed the desired industrial standards for impact resistance, temperature resistance and the like. Such material includes and is not limited to polymer materials, such as those that include polyethylene.

Attached to the frame member 12 are a lower adaptor unit 15 and an upper adaptor unit 17. Each unit 15, 17 is designed to decrease dirt or other particulates from entering the area between the first visor assembly 11 and the user's face

(hereinafter the "breathing zone") or the helmet. Each unit 15, 17 is interconnected to the frame member 12 and on the opposite side of the interconnection portion, each unit has a plurality of bristles 70 or a rubberized surface 70 that is designed to contact the exterior surface 89 when that portion of the unit 15, 17 is over the helmet 10. In addition, each unit 15, 17 through the bristles (rubber) 70 cleans the rails 13, and sometimes the exterior surface 89 of the helmet 10 when the unit 15, 17 passes thereon, which further ensures the rails 13 are particulate free. The bristles or rubberized surface 70 is also designed to form a releasable seal with a chin frame 152 (discussed in more detail below), which is designed to prevent undesired particulates to enter the breathing zone.

Alternatively, the second visor assembly 110 comprises a polymeric material 21 that is resistant to the environment (cold temperatures or heat resulting from fire), or resistant to particles, large or small, contacting it, or both, a frame 20 that contains the polymeric material 21. In one embodiment, the frame 20 is a single unit, as shown in Figure 1, that contains the polymeric material 21. In another embodiment, the frame 20 is divided into two components, a flip-top portion 23 and roller portion 25, as illustrated in Figures 2a-d. The flip-top portion 23 contains the polymeric material 21 and is able to be in an engage position, as shown in Figures 2b and c, or in the relax position, as shown in Figures 2a and d. In any embodiment, the frame 20 is able to move from an up position, as shown in Figure 2c, to a down position as shown in Figures 2a, b, and d.

The frame 20 moves along the rails 13 by a set of wheels 88 having an axle 60 securely attached to the frame 20. This system operates in the same manner in which the wheels operate for the first visor assembly. Depending on the embodiment, the helmet 10, or a component attached to the user, has a conventional monitoring device 130 that measures the flow of the air entering the helmet 10 and being directed to the breathing zone 199 (the area between the user's face and the visor 11 as shown in Figure 2c). When compressed air is used in lieu of powered air this alerts the user whether the air flow is sufficient for the user to continue using the respirator helmet. To assist the user know whether the air flow is sufficient for the user to continue using the respirator helmet, the helmet has at least a set of LEDs 132 to indicate the flow rate, as shown in Figure 5. These LEDs can be seen by the user at the side or on the first visor assembly or the second visor assembly. These LEDs receive an electric signal from a generator positioned on or within the helmet, or as a component attached to the user.

The respiratory air supplied to the breathing zone enters the helmet 10 from an air tube 28. The air tube 28 receives its air from a conventional source, like an air supply unit 140 which can be, for example, a conventional cylinder bank, a conventional remote blower, a conventional remote compressor, a conventional power air purifying assembly including a filter, motor, filter cartridges and combinations thereof, may be interfaced with the air reservoir and the air flow control regulators of a conventional flow filter assembly, a conventional self contained breathing apparatus (which can be supplied by Scott Technologies, Inc. of Lancaster, New York and Monroe, North Carolina), or alternatively from ambient air. The helmet 10 has an aperture 32 and within that aperture, the helmet 10 receives the air tube 28 or the ambient air. The air tube 28, however, should have a particular interconnection unit to maximize the movement of the user. In particular, the preferred interconnection has the air hose 28 having a spherical male component 35 and the aperture 32 has a spherical female component 34. Preferably, each component 35, 34 are made of a material that provides minimal friction, like a polymer. Thereby, the hose 28 and the helmet 10 have greater and easier rotational independence from each other, compared to the prior art designs. Such independence avoids fatigue to the user. The spherical female component 34 has a latch that rotates on a tangential orbit, identified as item 37. Thereby, the male component 35 can be easily removed.

The helmet 10 also has at least one channel 40, preferably a plurality, to direct the air from the removable spherical female component 34 to the breathing zone. The channel 40 is a polymeric, preferably polyethylene foam, conduit. The channel has one end connected to the air hose with a hose dock, and the other end is on a platform in the front part of the helmet 10. The channel 40 is longer that the space it is attached to, which provides tension to keep it in place without glue or other means of mounting, which could be used if desired. If the channel 40 is not permanently attached, then the channel 40 can be easily cleaned, which is desirable. The channel 40 also acts as a shock absorbing material that provides additional protection to the user's skull (cranium area). The channel 40 also insulates the air and therefore can convert cold air to ambient air, if desired. By the same process, the channel 40 can also alter hot air or air with moisture accumulating within the helmet into ambient air by the air currents generated through the channel 40. The channel 40 is also a conduit for electronic circuitry and insulating such circuitry from damage within the helmet.

The device 10 can also have a small blower motor 130b with some circuitry and at least one wire leading to the LED, or group of LEDs, as shown in Figure 5. The motor is mounted in the spherical female component (34) and basically acts as a small generator. The air flow turns the motor and generates current, which is used to build up a charge in a capacitor in the circuitry. Should the air flow decrease for some reason, the current from the motor will drop and the capacitor will be discharged over time through the circuitry to light the LED(s). The wires from the circuitry to the LED(s) are routed through, and protected by, the foam air channel. The LED(s) can also be interconnected to other devices 134, such as PASS units, self-contained breathing apparatuses, heat sensors, combinations thereof and the like.

The blower motor can also draw in ambient air into the helmet. When ambient air is used, the ambient air is drawn into the aperture 32, through a filter system 137, and into the channel 40 to the breathing zone, as shown in Figure 6. The filters used in this system are conventional filters that are known to those of ordinary skill in the art.

In addition, the respiratory helmet 10 can be fitted with a hood or shield 150 and a chin frame 152, as shown in Figures 7a-f. These hoods and shields can be any type of loose-fitting or tight fitting devices, examples of such hoods and shields are illustrated in Figures 7a-f. When the shields 150 are used, the helmet 10 calls for a chin frame 152. The chin frame 152 is a rigid to semi-rigid material that interconnects to the helmet 10. In particular, the chin frame 152 interconnects to the portion of the helmet 10 that is positioned above and behind the user's ears, as shown throughout Figure 7. The interconnection between the chin frame 152 and the helmet 10 can be permanent or alternatively removable as shown in Figure 7f. In either case, the means that the helmet 10 and the chin frame 152 interconnect together is through conventional techniques used in the industry. Examples of such techniques include and are not limited to sonic welds, rivets, indent fits, male and female snaps, nuts and bolts, hook and loop systems. Depending on the method to interconnect the chin frame 152 to the helmet 10, the chin frame 152 can have apertures 154, weld planes 156, or both, as shown in Figure 8. In addition, the chin frame 152 can have second apertures 158 positioned thereon. These apertures 158 can be air vents to allow the gaseous medium that enters the breathing zone to escape.

Attached to the lower portions of the chin frame 152 and the helmet 10 can be the hood/shield unit 150. The unit 150 can be removably attached with a a seal (preferred method), or alternatively permanently attached to the chin frame 152 and helmet 10. The unit 150 is gathered at the neck of the user. It may be loosely gathered at the neck to allow exhalation of gases between the neck gatherer and the neck or sealingly attached at the neck by means of rubber, draw strings, or elastic banding, or combinations thereof attached to the material. When sealing attached to the neck a exhalation or relief valve may be provided in the helmet 10 or in the air supply system of the helmet 10 in order to vent exhalation gases to the ambient environment. The unit 150 can be a neck protector, a neck and chest protector, a neck, chest and arm protector, as illustrated throughout Figure 7. In any case, the unit 150 can be any conventional material that protects the user from the potential injury that the user is exposed to. For example, the unit 150 can be mesh, fire- retardant material, heat resistant material, cold-resistant material, chemical resistant material, biological resistant material, nuclear resistant material or combinations thereof.

The chin frame 152 and the visor frame 12 can have a means to sealingly contact each other. In particular propylene or silicone material can be used to provide this releasable sealing fit. Adapted to the bottom of the chin frame is the flexible barrier material 150.

These various embodiments illustrate the different uses and adaptations of the present helmet 10. The helmet can be used in the fire industry, the chemical industries, the welding industry and other related industry that may require respiratory helmets. In other words, the present helmet is adaptable for various applications and industries and can be easily converted for particular applications relatively easily and efficiently. In addition, the visor 11 and the material 21 can be made of any type of material for a particular application. For example, the visor material 11, 21, can be made of transparent plastic or glass materials, or combinations thereof. In addition, the visor material 11, 21 can be embedded with mesh, coated with particular ultraviolet, infrared or natural light protectors, for example, gold, or combinations thereof. And as shown in Figure 7c, the visor material 11, 21 can be removed and replaced with a desired visor material.

As shown in Figure 7b, the helmet 10 can have a rubberized or metalized cover 160 thereon. The material is dependent on the application of which the helmet 10 is to be used.

While preferred embodiments of the invention have been illustrated and described it will be understood that modifications may be made within the competence of those skilled in the art without departing from the scope of the invention as defined in the appended claims.

Claims

We claim:

1. A respiratory helmet comprising a helmet designed to provide protection to a user's cranium area; a visor designed to provide protection to the user's face area; the visor can be positioned on the helmet, in front of the user's face area, and any position in between; the area between the visor, when the visor is positioned in front of the user's face area, and the face area is the breathing zone; the visor has at least two wheels; the visor has a top side and a bottom side wherein the bottom side is positioned closer to the user's chin when the visor is positioned in front of the user's face; an air intake system having an intake unit that receives a gaseous medium from a gaseous medium supply system or the ambient air into the helmet, and the intake unit directs the gaseous medium toward the breathing zone; a parallel elliptical rail system on the helmet that allows the visor to move in an elliptical motion, each rail receives at least one wheel of the visor; each rail is designed to decrease the accumulation of particulates on the rail.

2. The respiratory helmet of claim 1 wherein a cleaning unit surrounds the top side of the visor to assist clean the rails and the helmet.

3. The respiratory helmet of claim 1 wherein the helmet does not cover the user's ears.

4. The respiratory helmet of claim 1 wherein the helmet covers the user's ears.

5. The respiratory helmet of claim 1 wherein a conduit is positioned between the interconnect unit and the breathing zone.

6. The respiratory helmet of claim 5 wherein the conduit is made of a material that decreases the chances of injury and shock to the user.

7. The respiratory helmet of claim 6 wherein the material that decreased the chances of injury and shock to the user have polyethylene foam.

8. The respiratory helmet of claim 1 wherein each rail has a lip and a wheel rail.

9. The respiratory helmet of claim 8 wherein the wheel rail has a ledge that decreases the chances that particulates will accumulate on the rail.

10. The respiratory helmet of claim 8 wherein the wheels have at least one contacting surface that contacts the wheel rail.

11. The respiratory helmet of claim 10 wherein the contacting surface has at least one groove within the contacting surface.

12. The respiratory helmet of claim 8 wherein the lip is flared away from the helmet.

13. The respiratory helmet of claim 8 wherein the lip is straight.

14. The respiratory helmet of claim 1 wherein an adaptor unit is attached to the bottom side of the visor to decrease the accumulation of particulates into the breathing zone when the visor is positioned in front of the user's face, and onto the helmet when the visor is positioned entirely on the helmet.

15. The respiratory helmet of claim 1 wherein a set of LEDs are electrically connected to a third system that monitors the third system and positioned on the helmet in such a way that the user can view the LED's through the visor.

16. The respiratory helmet of claim 1 wherein a second visor is positioned over the visor.

17. The respiratory helmet of claim 16 wherein the second visor has at least two wheels and at least one wheel from the second visor is positioned on a corresponding rail of the elliptical parallel rails so the second visor can be moved.

18. The respiratory helmet of claim 16 wherein a set of LEDs are electrically connected to a third system that monitors the third system and positioned on the helmet in such a way that the user can view the LED's through the second visor.

19. The respiratory helmet of claim 1 wherein the gaseous medium supply system is a self-contained breathing apparatus.

20. The respiratory helmet of claim 1 wherein the gaseous medium supply system is ambient air.

21. The respiratory helmet of claim 1 having a fan within the air intake system.

22. The respiratory helmet of claim 1 wherein the helmet and the visor is designed to withstand impacts by objects, and variations of temperatures ranging from heat generated by fires to severe cold conditions.

23. The respiratory helmet of claim 18 wherein the third system is selected from the group consisting of PASS units, self-contained breathing apparatuses, heat sensors, combinations thereof.

24. The respiratory helmet of claim 15 wherein the third system is selected from the group consisting of PASS units, self-contained breathing apparatuses, heat sensors, combinations thereof.

25. The respiratory helmet of claim 1 wherein a set of LEDs are electrically connected to a unit that measures the quantity of the gaseous medium directed to the breathing zone, and positioned on the helmet in such a way that the user can view the LED's through the visor.

26. The respiratory helmet of claim 16 wherein a set of LEDs are electrically connected to a unit that measures the quantity of the gaseous medium directed to the breathing zone, and positioned on the helmet in such a way that the user can view the LED's through the second visor.

27. The respiratory helmet of claim 1 wherein the gaseous medium is air.

28. A method of using a respiratory helmet comprising: placing respiratory helmet having (A) a helmet designed to provide protection to a user's cranium area; (B) a visor designed to provide protection to the user's face area; the visor can be positioned on the helmet, in front of the user's face area, and any position in between; the area between the visor, when the visor is positioned in front of the user's face area, and the face area is the breathing zone; the visor has at least two wheels; the visor has a top side and a bottom side wherein the bottom side is positioned closer to the user's chin when the visor is positioned in front of the user's face; (C) an air intake system having an intake unit that receives a gaseous medium from a gaseous medium supply system or the ambient air into the helmet, and the intake unit directs the gaseous medium toward the breathing zone; (D) a parallel elliptical rail system on the helmet that allows the visor to move in an elliptical motion, each rail receives at least one wheel of the visor; each rail is designed to decrease the accumulation of particulates on the rail, on a user's head; positioning the visor into a desired position.

29. The method of claim 28 wherein the helmet has a plurality of LEDs positioned on the helmet that allows the user to monitor the gaseous medium being provided to the breathing zone.

30. The method of claim 29 wherein the helmet has a plurality of LEDs positioned on the helmet that allows the user to monitor the operation of third systems.

31. The respiratory helmet of claim 1 further comprising a particulate barrier material that prevents the contamination of the breathing area from undesired particulates, and is attached to the helmet.

32. A respiratory helmet comprising a helmet designed to provide protection to a user's cranium area; a visor designed to provide protection to the user's face area; the visor can be positioned on the helmet, in front of the user's face area, and any position in between; the area between the visor, when the visor is positioned in front of the user's face area, and the face area is the breathing zone; the visor has a top side and a bottom side wherein the bottom side is positioned closer to the user's chin when the visor is positioned in front of the user's face; an air intake system having an intake unit that receives a gaseous medium from a gaseous medium supply system or the ambient air into the helmet, and the intake unit directs the gaseous medium toward the breathing zone; a chin frame that extends from the helmet and is designed to protect the user's chin, and when the visor is positioned in front of the user's face area, the bottom side forms a releasable sealingly engagement with the chin frame.

33. The helmet of claim 32 further comprising a flexible particulate barrier material that prevents the contamination of the breathing area from undesired particulates, and is attached to the helmet and the chin frame and covers at least a portion of the user's neck.

34. The helmet of claim 33 wherein the particulate barrier material is removable.

35. The helmet of claim 32 wherein the chin frame is removable.